Bob McGrath, who has played Bob on the popular children’s show “Sesame Street” since 1969, told a Florida Supercon audience that he “has been graciously let go” from the show. “I have completed my 45th season this year,” McGrath said. “And the show has gone under a major turn around, now going from an hour to a half-hour.” Roscoe Orman, who played Gordon, and Emilio Delgado, who played Luis were also let go. “HBO has gotten involved also,” McGrath said. “And so they let all of the original cast members go, with the exception of Alan Muraoka [who plays Alan, the owner of Hooper’s store], who is still on the show and who is probably 20 years younger than the rest of us, and Chris Knowings [who plays Chris], who is also young and they are terrific, wonderful people.” “Sesame Street” tweeted a statement on Thursday, saying, “Since the show began, we are constantly evolving our content and curriculum, and hence, our characters, to meet the educational needs of children.”